No power after 3500 spark plugs black and fouling

[maddog_187]

First of all thanks in advance! I need this car for a daily driver and quick because I had to sell my Durango.

The car starts out with good power but once you reach about 3500 - 4000 rpm it loses all power unless you barely give it gas. I've changed plugs (3 times), plug wires, coil pack, mass air flow, fuel filter (had to switch back to used one because the new one leaked), I've done boost leak, checked fuel pressure. What else am I missing? the plugs become black sooty looking after 1 mile of driving. They are dry no oil in cylinder. It is running rich but what am I missing? Once the car is warmed up it does not idle very well. If it is cold it idles good. Here is a picture of a brand new ngk after 1 mile of driving.

 

[ineedagsx]

try some techron injector cleaner

 

[maddog_187]

I used lucas injector cleaner already and also have a bottle of octane boost in the tank. I was hoping that it would get all cleaned out by driving it a little but no such luck.

I also forgot to mention this is not the car in my profile this is a stock 1g talon except for k&n and egr eliminated.

 

[DSM1G90]

Plugs are firing through a rich mixture and all of that over-the-counter junk ain't gonna cure any of this.

You could have an ECU issue causing A/F ratio problems since the injectors are shoving in too much fuel at certain period.

Any CEL lights coming on for mine did basically the same and had a bad section in the ECU that had to be repaired.

 

[maddog_187]

No no cel's yet. I had the ecu out no long ago but didn't notice any leaking I will check it again a little closer.

 

[iron bird]

i have same problem ive got a new ecu on the way

 

[maddog_187]

It looks like a tiny bit of leaking on capictors but not much so I am going to swap my extra 90 ecu in to it and try that I just hate swapping the pins in the mean time feel free to throw out any other ideas.

yeah it runs again you guys were right the ecu was the problem. I swapped my 90 ecu in and runs good but now throwing a cel. I would assume its from o2 from running rich so trying to reload my palm to check. Thanks again guys. To those of you who read in future never be afraid to check things twice it pays off.